Heirloom Tomato Tart

Ingredients

• Tart Dough

  • 1 cup (150 g) unbleached all-purpose flour
  • 1/4 tsp salt
  • 6 tbsp (85 g) cold unsalted butter, diced
  • 3 tbsp (45 ml) ice water

• Filling

  • 1 1/2 lb (675 g) heirloom tomatoes, cut into 1/4-inch (5 mm) slices
  • 1 tsp salt
  • 2 tsp (10 ml) whole-grain mustard
  • 1 1/2 cups (150 g) Gruyère cheese, grated 
  • 1/2 cup (25 g) fresh herbs, chopped (such as basil, thyme, chives)